Results 1 to 8 of 8
  1. #1
    RC Qualifier
    Join Date
    May 2008
    Location
    Southampton, UK
    Posts
    377

    Tutorial: how to increase your DX3S range

    If like me, you are well impressed with the specification of the Spektrum DX3S, but very disappointed by its range, then this tutorial is for you. Since I got mine over 1 year ago I've been looking for ways to get it past the approximate 100 metre standard range without glitching. With this mod, I have gone as far as I can still see the car - and have even bent the transmitter aerial into a horizontal position to weak the signal (bad for 2.4g systems), and this had no effect.

    The parts you will need are:
    * RG178 coax cable
    * Small screwdriver
    * Soldering iron / solder
    * Sharp knife
    * Heatshrink
    * Aerial tube
    * Tape measure
    * Drill and 2mm bit

    Note that in this example, the photos were taken whilst modding my Rustler VXL receiver, but it is exactly the same principle for any other vehicle.
    Step 1
    -------
    Get your stock receiver and clean it up


    Step 2
    ------
    Using a small screwdriver, prise open the receiver case. It should come apart fairly easily. Separate the items and remove the electronics from inside



    Step 3
    -------
    Using the 2mm drill, drill out the stock antenna hole in the top case.



    Step 4
    ------
    Using a sharp knife, scrape away the glue from around the base of the stock aerial. Once the glue is cleaned away, heat the solder from the rear of the circuit board with the soldering iron to remove the stock aerial.



    Step 5
    -------
    One you have removed the glue and aerial, you need the sharp knife again. Scrape away some of the screen board covering to reveal the gold circuit board underneath. Make sure you remove enough as you will later on need to solder the ground from the new antenna to this part.



    Step 6
    -------
    Get your RG178 coax cable. Using the sharp knife, carefully strip the outer plastic covering from the cable. Do this about 1.5 - 2cm back from the end of the cable.

    Once you have removed the outer plastic sheath, this reveal the braiding that goes around the inner core of the coax. Using a drawing pin or something sharp, carefully run this up through the braided cable starting near the top of the cable, working down towards the lowest part where you have exposed it. Take time here, as the fine strands are easy to break and they get easily knotted when you separate them. At the end, you want the braided part to be separated, exposing the inner core (which is also covered in plastic).

    Once you have done this, twist the strands to form a fine single cable. Then, tin these strands using your soldering iron to form a solid core.

    For the inner core, remove the plastic insulation a few mm above where the braiding is exposed - you do not want the two parts of the cable to touch each other or the aerial will be seriously compromised. Remove the plastic insulation to reveal the thin inner core. Twist these to form a fine core.



    Step 7
    ------
    Going back to the circuit board, carefully tin the area of circuit board where you removed the green covering earlier.



    Step 8
    ------
    Using the soldering iron, heat the just behind where the antenna comes throug the hole in the board to allow the solder to melt. At the same time, push the new antenna through from the component side of the circuit board. Once pushed through, solder the core fully into position.



    Step 9
    ------
    Now solder the braided part of the antenna to the pre-tinned part of the circuit board you prepared earlier.



    Trim the inner and outer cores so they are neat

    Step 10
    --------
    Reassemble the receiver.



    cont....
    EMaxx MM2200-6S,Rustler VXL,Twin Detonator,L/Box

  2. #2
    RC Qualifier
    Join Date
    May 2008
    Location
    Southampton, UK
    Posts
    377
    EMaxx MM2200-6S,Rustler VXL,Twin Detonator,L/Box

  3. #3
    RC poster
    Join Date
    Feb 2013
    Posts
    3
    hi, tmaxxnutter,
    i also would like to change my spektrum receiver's antenna, according to your tutorial. however i am little confused about the step 7 and 9. you said the "green covering" should be removed and which is latter the "braided part" should soldered to. can you possibly update a sharp picture to identify the "green covering"? or send it to me at fanolito@hotmail.com?

    great great thanks.

  4. #4
    RC Qualifier
    Join Date
    May 2008
    Location
    Southampton, UK
    Posts
    377
    PM sent just now.
    EMaxx MM2200-6S,Rustler VXL,Twin Detonator,L/Box

  5. #5
    RC poster
    Join Date
    Feb 2013
    Posts
    3


    Last edited by fanolito; 04-27-2013 at 08:14 AM.

  6. #6
    RC poster
    Join Date
    Feb 2013
    Posts
    3
    before you confirm my puzzle, i already solder the antenna as i thought it should be.

    i did not apply too much tin, to avoid the heat burns the plastic tube.

    can you tell me have i made a terrible mistake?


  7. #7
    RC Qualifier
    Join Date
    Jan 2013
    Location
    Gurley, Alabama
    Posts
    766
    I'm surprised that the Spectrum's Tx/Rx for cars has such A short range. The ones on my heli's will go farther than I can see them and that's A long ways in the air. I guess they think you don't need it.

  8. #8
    RC Qualifier
    Join Date
    Dec 2010
    Location
    recalculating...
    Posts
    581
    I'd be curious to see if you could rig up a 2.4ghz circularly polarized antenna set for a car radio.
    I like turtles.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •